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- Possible diseases and pests at a glance
Gooseberries are very robust because of their thorns, but this plant is still not immune to diseases and pests. Here is an overview of the most common gooseberry diseases and possible pests.Although gooseberries have thorns, they are no less susceptible to fungal diseases and other pests than other plants. On the contrary. Straight gooseberries are especially mildew-prone.
The yellow gooseberry wasp, the American gooseberry powdery mildew and leaf fall disease are among the biggest threats to gooseberry bushes in your garden. Learn here how to recognize the respective infestation and which preventive and combating measures you can take to protect the plants and fruits.
Possible diseases and pests at a glance
Yellow gooseberry wasp
The larvae of the yellow gooseberry wasp eat the leaves of the berry bush. Heavy infestation without determined control often leads to complete baldness, which also spreads to the fruits. Typically, the damage begins at the inner shoots of the shrub and then gradually expands into the outer area. They can easily recognize the larvae by their green-yellow bodies covered with black dots.
The most important preventative measure is a loose, open cut of the shrub, which also does well for berry growth. Check the inner shoots regularly. Once you see the white, elongated gooseberry wasp eggs, collect them thoroughly. Shake the shrub vigorously. Overlooked larvae then fall off. Unfortunately, an advanced infestation can only be effectively controlled with insecticides. Since the larvae of the yellow gooseberry wasps hibernate in the soil, replacing the soil under the shrub for protection next year makes sense.
Leaf fall disease
If you spot yellowish spots on the leaves of the berry bush during the rainy weather during the summer months, this is an indication of leaf fall disease. The dots soon take on a darker color and expand into spots that eventually merge into each other. The leaf turns yellow and falls off during the summer. The shrub does not die directly from it, but is extremely weakened.
Leaf fall sickness is caused by the harmful fungus Drepanopeziza ribis wintering in the leaves of the gooseberry. The complete removal of all leaves is the first and most important control measure.
Lightly clear the shrub before the growth period of next year to ensure good aeration of the leaves.
American gooseberry powder
An attack of American gooseberry powdery mildew is indicated by a dirty whitish discoloration of the shoot tips, the leaves and the fruits. Unfortunately, the disease is not completely ruled out even in varieties that are commercially labeled as mildew-resistant.
Remove all affected parts of the plant as soon as you notice an infestation. Shorten the shoots that do not fall prey to the annual rejuvenation cut by one-third before the start of the next growth period. The fungus prefers wintering in the shoot tips of the shrubs.